Insulator-pin.



M. G. KENNEDY.

Patented May 30,

W/TNESSES.

THE CQLUMMA PLANOGRAPM co, WASHINGTQH, n. c.

MATTHEW G. KENNEDY, OF PHILADELPHIA, PENNSYLVANIA.

INSULA'IOR-PIN.

Specification of Letters Patent.

Patented May so, 1916.

Application filed November 7, 1914. Serial No. 870,728.

To all whom it may concern Be it known that I, hLrrTHnw G. Knx- NEDY, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Insulator-Pin, of which the following is a specification.

The invention relates to improvements 1n insulator pins used in connection with wood or metal cross-arms for supporting electric conductors and the like.

The principal object of the present invention is to provide an insulator pin possessed of the good qualities of both metal and wooden pins but free from the defects and disadvantages of each; or in other words, to provide a self-contained insulator pin which shall possess the strength of a metal pin and the insulating and other qualities of a wooden pin which is adapted to support an insulator without dangenof breakage of the latter, either by the action of the current or by atmospheric conditions of heat and cold.

The invention will be claimed at the end hereof but will be first described in connection with the embodiments of it chosen for illustration in the accompanying drawings, in which- Figure 1 is a side view partly in section of the metal base fitting. Fig. 2 is a sectional view of a top or cap. Fig. 3 is a side View of the assembled insulating pin embodying features of the invention. Fig. 4 is a 'top and Fig. 5 a transverse sectional view of a metal base fitting section embodying a modification of the invention. Fig. 6, is a side view of a bolt adapted for use in connection with the part shown in Figs. i and 5, and Fig. 7 is a side view partly in section of an insulating pin embodying a modification of the invention.

In the drawings the cap or top consists of Wood or its equivalent and is therefore designated wooden. The wooden cap or top is externally conical as at 1 and is externally threaded at one end, as at 2. Within the wooden cap or top there is a longitudinal cavity of which a part 3 is conical and a part 4: cylindrical.

Referring to Figs. 1 and 3, the hollow metal base fitting is provided with a projection of which a part 5 is conical and a part 6, cylindrical. The base fitting is provided with a flange 7 and with an opening 8. In the finished structure or insulating pin the wooden top or cap is fitted onto the metal base and the parts are connected by swaging the flange 7 onto the conical part 1 of the top or cap. It will be noted that the part 9 of the top or cap covers the metal base fitting so that one end of the metal base fitting is entirely inclosed in and covered by the wooden cap. The parts are connected so that they constitute a unitary structure that can be shipped and handled without coming apart. The hole 8 is provided in case the insulating pin should be used on a wooden cross-arm and in that case the hole receives a nail that is frequently used for attaching the pins to the cross-arm.

Obviously since the pin, with the exception of the part 9, consists throughout its length of metal, it follows that it is possessed of the strength of that material. However, the wooden top, or perhaps more accurately, the thread 2 formed on it, re ceives the insulator and under the action of heat and cold, wood does not tend to break the insulator. Furthermore the wooden top, more especially the part 9 of it, covers the metal base and so prevents the action of the current from breaking through the insulator, which is perhaps of more importance where metallic cross-arms are employed.

The construction and operation of the modification of the invention shown in Figs.

5 to 7 are as has been above described, eX- cept as will be now pointed out. The conical part 5 and the flange 7 of the base section are made in one piece and the cylindrical part 6 and a part of the conical portion 5 constitute the head of a bolt 10, which is strung through an opening in the base section. The wooden top is applied as before by swaging the flange 7 a and after the parts have been assembled and swaged, they are held together in a unitary structure. The bolt constitutes a means for attaching the insulating pin to the cross-arm. If desired spurs 11 may be provided for preventing rotation of the insulating pin when the insulator is screwed onto the thread 2.

It will be obvious to those skilled in the art that modification may be made in details of construction and arrangement without departing from the spirit of the invention so that the latter is not limited as to those matters or further than the prior state of the art and the appended claims may require.

What I claim is:

1. An insulating pin comprising the combination of an externally conical wooden cap or top externally threaded at one end and having a longitudinal cavity of which a part is conical and a part is cylindrical, and a hollow metal base fitting having a projection which is part conical and part I a part is conical and a part is cylindrical, a

hollow metal base fitting section having a conical part inclosed by the top or cap, a bolt extending through said section and having its head in engagement with said section and part conical and part cylindrical and covered and inclosed by the top or cap, and a flange on the section swaged onto the conical part of the top or cap. 7

3. An insulating pin comprising the combination of a wooden cap or top externally threaded at one end and having a longitudinal cavity and a metalbase fitting having a projection arranged in said cavity and which is covered and inclosed by the top or cap and having a flange swaged onto the top or cap, substantially as described.

In testimony whereof I have hereunto 7 signed my Copies of this patent may be obtained for five cents each, by addressing the Commissioner of lfatents,

' Washington, D. G. 

